#include<stdio.h>

int Sum(int s,int e)
{
   int result = 0;
   for(int i =s;i<=e;i++)
   {
	result += i;
   }
   return result;
}

int main()
{
   int start =1;
   int end =100;
   printf("Begin!\n");
   int n = Sum(start,end);
   printf("running done,result is:[%d-%d]=%d\n",start,end,n);
   return 0;
}

